21023133 has 8 divisors (see below), whose sum is σ = 28193568. Its totient is φ = 13934064.

The previous prime is 21023117. The next prime is 21023137. The reversal of 21023133 is 33132012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21023133 - 2⁴ = 21023117 is a prime.

It is a super-2 number, since 2×21023133² = 883944242271378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19735 + ... + 20772.

It is an arithmetic number, because the mean of its divisors is an integer number (3524196).

Almost surely, 2^21023133 is an apocalyptic number.

It is an amenable number.

21023133 is a deficient number, since it is larger than the sum of its proper divisors (7170435).

21023133 is a wasteful number, since it uses less digits than its factorization.

21023133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40683.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21023133 is about 4585.0990174695. The cubic root of 21023133 is about 275.9936855308.

Adding to 21023133 its reverse (33132012), we get a palindrome (54155145).

The spelling of 21023133 in words is "twenty-one million, twenty-three thousand, one hundred thirty-three".